[xml] XML validation

[Yan Seiner <yan seiner com>]

I have an embedded system that uses XML extensively.  Many of the XML 
files are modified and generated by other software.  I am looking for a 
simple XML well-formedness checker, something I can point at an XML file 
and tell the user that s/he has a problem with file xyz.xml around line 
YYY or maybe element XXX.

Does any such thing exist?  I've found RXP, but it doesn't use 
libxml.... I really don't want to introduce more stuff into my (already 
bloated) embedded box...

--Yan